我如何制作一个将接受字符串并从字符串返回第二个字符的函数？

Question

For example if the function is given the string "ABCD" the function should return the letter B. This is code i've written so far but i'm getting a few errors which i've been trying to fix for three hours now!

import java.util.Scanner;
public class Stringg {

public static void main(String[] args) 
{
    System.out.print("Please enter a string: "); 
    mystring = Scanner.nextLine();
    public static char getSecondChar(String myString) { 
    return myString.charAt(1); 
    }
    System.out.println("The second character is " + getSecondChar  (myString));

Answer 1

       public class SecondChar {
        public static char secondChar(String str){
            char[] charArray=str.toCharArray();
                if(charArray.length<=1)
            {
                 System.out.println("String does not have 2nd character!");
                 return 0;
            }
            return charArray[1];
        }

    public static void main(String a[]){
        String str="ABCD";
        System.out.println(secondChar(str));
    }
    }

Answer 2

In java, writing a function inside a function doesn't mean anything. You need to write functions in different scopes.

Answer 3

Try this. Do not create your function inside the main method. You will only need to call the function inside the main method to work.

public class Stringg {

    public static char getSecondChar(String myString) { 
        return myString.charAt(1); 
    }

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.print("Please enter a string: "); 
        String mystring = sc.nextLine();
        System.out.println("The second character is " + getSecondChar(mystring));

    }

}